Chenbro 2U Rack Mount without Power Supply Server Chassis (RM21600-T) Case Type: 2U Rack mount Server Chassis Material: 1.2mm SGCC M/B Type: Extended ATX (12"x13"), CEB1.0 M/B Support CPU Type: DP Xeon/ DP Opteron/DP Nocona Drive Bays: 4x front-access 5.25"; 2x front-access 3.5" Expansion Slots: 3x full size or 6x low profile Cooling System: 4x 80mm middle fans I/O Panel: 2x USB 2.0 ports